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A low sintering temperature glass based on SiO 2 –P 2 O 5 –ZnO–B 2 O 3 –R 2 O system for white LED s with high color rendering index
Author(s) -
Kim Seonghyeon,
Park HyunA,
Im Won Bin,
Heo Jong,
Choi JaeYoung,
Chung Woon Jin
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15043
Subject(s) - phosphor , sintering , color temperature , materials science , color rendering index , luminescence , thermal stability , analytical chemistry (journal) , mineralogy , light emitting diode , optoelectronics , composite material , chemical engineering , chemistry , chromatography , engineering
A low sintering temperature glass based on the SiO 2 –P 2 O 5 –ZnO–B 2 O 3 –R 2 O (R=K and Na) system was studied as a matrix for embedding phosphors to fabricate color tunable white LEDs. The proposed system, which uses no heavy‐metal elements and can be sintered at 500°C, incorporates thermally weak commercial phosphors such as CaAlSiN 3 :Eu 2+ to produce phosphor‐in‐glasses (PiGs). Changing the mixing ratio of glass to phosphors affected the photo‐luminescence spectra and color coordinates of the PiGs when mounted on a blue LED. The color rendering index (CRI) and color correlated temperature (CCT) of the LED s were also varied with the mixing ratio, providing color tunable white LED s. A high CRI , up to 93, as well as highly improved thermal stability were obtained, along with a low sintering temperature compared to other glass systems, suggesting the practical feasibility of the proposed system.